Axial locating means for workpieces



Aug. 25, 1964 R. EJPRICE ETAL AXIAL LOCATING MEANS FOR woRKPIEcEs' 3Sheets-Sheet 1 Filed March l, 1962 Hill INVENToRs RALPH PP/CE Wl LLIH E.HPPEL E ATTORNEY N` .N N H .M M a wm W Nm. R. hm. j m M w .l s a l n Juw QN n 5m H \\\\w\ mw 4) rn rm .m

Aug- 25 1964 R. E. PRICE ETAL 3,145,507

AXIAL. LOCATING MEANS FOR WORKPIECEZS Filed March l, 1962 5 Sheets-Sheet2 INVENTORS RALPH E. PRICE [L BY WILLIAM :.HAPPEL ATTORNEY Aug- 25, 1964R. E. PRICE ETAL AXIAL LOCTING MEANS FOR WORKPIECES 3 Sheets-Sheet 5Filed March l, 1962 INVENTORS RAL PH E. PRICE BY WILL/A EHI/APPELATTORNEY v United States Patent O 3,145,507 AXIAL LCATING NLEANS FRWORKPIECES Raph E. Frise and Wiliiani E. Happel, Waynesboro, lia.,assignors to Landis Tool Company, Waynesboro, Pa. Fied Mar. 1962, Ser.No. 176,561 aimsr (Cl. Slt-195) This invention relates to grindingmachines, particularly cylindrical grinding machines, and more particularly, to means for axially locating workpieces from a ange or other endsurface on the workpiece.

The reference surface from which the axial location of a workpiece for agrinding operationy is determined, is selected by the user of themachine in accordance with a predetermined series 0f operations on theworkpiece.

Where the reference surface is a flange or other end surface on aworkpiece, the locating surface is usually the face plate ony theheadstock or means attached to the face plate. For many tolerancerequirements, the face plate does not run true enough to serve as alocating surface.

Where the end portion of the workpiece includes an annular surface to beground, it is essential that it is protected against run-out of the faceplate which would cause axial movement of the work relative to thegrinding wheel.

lt is, therefore, an object of the present invention to provide meansrotatable with the face plate having a work engaging surface free toadapt itself to the reference surface of a workpiece.

Another object is to provide means whereby the workpiece is properlysupported on the headstock center before it engages the locatingsurface.

Another object is to provide means to isolate a Workpiece from theeffect of run-out of the face plate.

FIG. l is a sectional elevation of a headstock spindle with the sectionmarked B-B taken along the line B-B of FIG. 3 and the section marked A-Ataken along the line A-A of F IG. 3.

FIG. 2 is a partial front View, in section, showing the left hand end ofthe headstock spindle.

FIG. 3 is a right hand end view of a headstock.

FIG. 4 is a plan view of a footstock, partly in section.

A grinding machine headstock 1i? mounted on swivel table 11 has anon-rotatable spindle 12 on which a work drive pulley 13 is rotatablysupported on anti-friction bearings 14 and 15.

Face plate 16 is attached to pulley 13 by screws 13 and face plateadapter 17 is attached to face plate 16 by screws 19.

Annular driving plate Ztl has oppositely disposed trunnion members 21for pivotally supporting itself on adapter 17. Adapter plate cap 22 issecured to adapter 17 by screws 23 to hold trunnion members 21 in place.

Annular locator plate 25 has oppositely disposed trunnion members 26 forpivotally supporting itself on annular driving plate to which it issecured by locator plate caps 27 which hold trunnion members 26 inplace. Locator plate 2S has angularly spaced, axially projectingportions 23 for engaging and locating flange 30 of workpiece W.

Headstock center itl is supported in sleeve 41 which, in turn, issiidably mounted in spindle 12. Spring 42 at the outer end of headstock10 normally holds sleeve 41 and headstock center liti in a position toreceive a workpiece before flange 3i) engages portions 28. With thisarrangement, workpiece W is firmly supported on both the headstockcenter 46 and portions 28.

The other end of workpiece W is engaged by footstock center liwhich isurged against said workpiece` by spring 51. Spring 51 exerts aforcegreater than springt42' and, therefore, footstock center Sil movesworkpiece W and headstock center 46 to the left until flange 3d engagesthe portions 28.

Workpiece W'has two portions 31' and 32 to be ground by grinding wheels33 and 34; An' annular surface 35 of workpiece W is also ground bygrinding wheel 33. It is obvious that endwise movement of the wor'k dueto run-out of the face plate 16 or any other cause. would preventasatisfactory grindingoperation on surface 35 of workpiece W. Thisinvention prevents such run-out by supporting the locating surfaces on auniversal mounting and yieldingly holding the workpiecein spacedrelation tothe locating surfaces so that the workpiece is first firmlyengaged by the headstock center and' then by the locatin'gsurfaces.

The means for driving workpiece W consists of a bar 6) pivotallyattached to'face" plate adapter 17 at' 61'. A pair of work engagingfingers 62 are attached to the other end of bar 6i? and are free to moveaxially in notches 63 of workpiece W. Bar 60 is resiliently held inposition for engaging workpiece W by means of spring 65 attached to faceplate adapter 17 and an adjustable abutment 66 attached to annulardriving plate 20.

We claim:

1. lin a grinding machine, a grinding wheel, means for rotatablysupporting and locating a cylindrical workpiece having a locatingsurface at one end for a grinding operation comprising a headstock and afootstock, a center in said headstock, a center in said footstock, afirst resilient means for urging said headstock center toward saidfootstock center, a second resilient means for urging said footstockcenter toward said headstock center, said second resilient meansexerting a greater force than said first resilient means, means foraxially locating said workpiece relative to said grinding wheelcomprising a face plate on said headstock, a rst member pivotallymounted on said face plate on a rst radial axis, a second memberpivotally mounted in said first member on a radial axis at right anglesto said first radial axis, said second member having locating means forengaging said locating surface of Said workpiece, said workpiece andsaid headstock center being adapted to be moved axially by saidfootstock center until said locating surface engages the locating meanson said second member.

2. In a grinding machine, a grinding wheel, means for rotatablysupporting and positioning a cylindrical workpiece comprising aheadstock and a footstock, a center in said headstock, a center in saidfootstock, a face plate on said headstock, said workpiece having areference surface on the end adjacent said headstock, means on said faceplate for positioning said workpiece axially relative to said grindingwheel comprising a first member pivotally mounted on said face plate ona first radial axis, a second member pivotally mounted in said firstmember along a radial axis at right angles to said first radial axis,locating means on said second member for engaging and locating saidreference surface of said workpiece, means to hold said headstock centernormally in position to support said workpiece with said referencesurface in axially spaced relation to said locating means, and means tomove said workpiece and said headstock center axially against saidholding means until said reference surface engages said locating means.

3. In a grinding machine, a grinding wheel, means for rotatablysupporting a cylindrical workpiece comprising a headstock and afootstock, a center in said headstock, a center in said footstock, aface plate on said headstock, means for positioning said workpieceaxially relative to said grinding wheel comprising locating means onsaid face plate, an end surface on said workpiece for co acting withsaid locating means, a universal connection between said locating meansand said face plate, yielding means to hold said headstock centernormally in position to support said workpiece with said end surface inaxially spaced relation to said locating means, and means to hold saidworkpiece against said locating means.

4. In a grinding machine, a grinding wheel, means for rotatablysupporting and positioning a cylindrical workpiece comprising aheadstock and a footstock, a center in said headstock, a center in saidfootstock, a face plate on said headstock, means for positioning saidworkpiece axially relative to said grinding wheel comprising locatingmeans on said face plate, an end surface on said workpiece for co-actingwith said locating means, a universal connection between said locatingmeans and said face plate, means to hold said headstock center normallyin position to Support said workpiece with said end surface in axiallyspaced relation to said locating means, and means to move said workpieceand said headstock center axially against said holding means until saidworkpiece engages said locating means.

5. In a grinding machine, a grinding wheel, means for rotatablysupporting a cylindrical workpiece comprising a headstock and afootstock, a center in said headstock, a center in said footstock, aface plate on said headstock, means for positioning said workpieceaxially relative to said grinding wheel comprising locating means onsaid face plate having arcuately spaced and axially extending members,an end surface on said workpiece for co-acting with said locating means,a universal connection between said locating means and said face plate,yielding means to hold said headstock center normally in position tosupport said workpiece with said end surface in axially spaced relationto said locating means, and means to hold said workpiece against saidarcuately spaced and axially extending members.

References Cited in the le of this patent UNITED STATES PATENTS1,854,618 McGrady Apr. 19, 1932 2,526,796 Asbridge Oct. 24, 1950 FOREIGNPATENTS 823,559 Germany Dec. 3, 1952

1. IN A GRINDING MACHINE, A GRINDING WHEEL, MEANS FOR ROTATABLYSUPPORTING AND LOCATING A CYLINDRICAL WORKPIECE HAVING A LOCATINGSURFACE AT ONE END FOR A GRINDING OPERATION COMPRISING A HEADSTOCK AND AFOOTSTOCK, A CENTER IN SAID HEADSTOCK, A CENTER IN SAID FOOTSTOCK, AFIRST RESILIENT MEANS FOR URGING SAID HEADSTOCK CENTER TOWARD SAIDFOOTSTOCK CENTER, A SECOND RESILIENT MEANS FOR URGING SAID FOOTSTOCKCENTER TOWARD SAID HEADSTOCK CENTER, SAID SECOND RESILIENT MEANSEXERTING A GREATER FORCE THAN SAID FIRST RESILIENT MEANS, MEANS FORAXIALLY LOCATING SAID WORKPIECE RELATIVE TO SAID GRINDING WHEELCOMPRISING A FACE PLATE ON SAID HEADSTOCK, A FIRST MEMBER PIVOTALLYMOUNTED ON SAID FACE PLATE ON A FIRST RADIAL AXIS, A SECOND MEMBERPIVOTALLY MOUNTED IN SAID FIRST MEMBER ON A RADIAL AXIS AT RIGHT ANGLESTO SAID FIRST RADIAL AXIS, SAID SECOND MEMBER HAVING LOCATING MEANS FORENGAGING SAID LOCATING SURFACE OF SAID WORKPIECE, SAID WORKPIECE ANDSAID HEAD-